All-porcelain tooth



H. S. LOWRY.-

ALL PORCELAIN TOOTH. APPLICATION FILED MAY I9 1920.

1,377,358. Pa Qnt d'MayIO, 1921.

snare AR R on Kansas crrY, MIsso-um.

: Application filed May 19,

and State of Missouri, have invented a cer-v tam new and usefuljlmprovement in All- Porcelain Teeth, of which the following'i's ing the invention, buta complete specification.- r

This invention relates to artificial teeth'of that class usually denominated allaorcel-ain teeth, and used commonly in platework or secured in place by pins anchored in natural tooth. roots, and my object is to produce atooth of'this character provided" with a re inforcement which increases the strength of the tooth as contrasted with a tooth baked to the customary anchoring pin, which actually weakens the tooth." A further object is to produce an all-porcelain tooth which can be used in. bridgework and alsoin such work, serve as anL-abutmentor support for 'a juxtaposed tooth or a pair of juxtaposed; teeth.

With these general objects. in view and others as hereinafter appear the invention consists. in certain novel and'useful features of construction and combinations of parts as hereinafter described and claimed; and in order thatit may be fully understood reference is to be'had to the accompanying drawing, in which:

F igure 1 is a front elevation of a tooth provided with a reinforcement embodying the invention. h

Fig. 2- is a vertical section taken onthe line 11-11 of F ig. 1. s

Fig. 3 is a horizontal section taken on the line IIIIII of Fig. 1. t

Fig. 4 is a detail view ment.

Fig. 5 is a detail view of an allrporcelain" or equivalent material for use in conjunction with the reinforcement shown'by Fig. 4, Fig 5 representing a view taken at right angles to that shown by Fig. 'l.

Fig. 6 is an elevation of a tooth embodyshown as equipped also with a pin for anchorage in a root of a of the reinforce- 7 natural tooth.

Fig. 7 is a central vertical section of the construction shown by Fig. 6. I Fig. 8 is a vertical section similar to Fig.

but showing a porcelain tooth prepared for use in a rubber plate.

Fig. 9 is an elevation of a series of teeth including a pair ofiall-porcelain teeth, and

Specification of Le ters Patent. 7

' porcelain a suiiicient type mentioned in that it nm roncnrain room.

1920. sen-a No. 382,513.

disclosing how the' sa-me may be employed in bridgework where-the ends ofthe bridge are fastened to twonatural teeth. I

Fig. 10 is a similar view but showing where one end of the bridgeis fastened to an inlayof a natural tooth.

Refermngto the drawing in detail-,-*l'in dicates a tooth made of porcelain or the like, 7

and provided in: its base, i. 0., lower end, accordingly as it is lower or upper jaw,- with U-shaped groove 2, the arms of the groove being in the side its upper or faces of the tooth and the connecting por-' tion of the groove extending across the tooth in a direction generally parallel to the labial or huccal' face thereof. A'rUshaped rein forcement 3, of gold or fits thisgroove and is cemented therein, the

; external surface of the reinforcement being flush with the exterior surface of the tooth;

ene a Ma an, V 19.21.

used in the I the like, accurately" I This reinforcement increases the strength of of greater strength than the porcelain and guards against fracture of the latter-beextend along the sides ofthe part of the length: of

cause its arms tooth for the greater the same without being'emhedded into the depth to wveaken I the intervening portion. thereof, that is, the portiofnlying between the arms of the reinforcement, as is truewhere the customary pin is employed for anchoring a porcelain tooth to a natural tooth root, if the porcelain tooth is of the incisor orcanine type where theemhedded end of the pin comes close to the surface of the tooth and leaves'but little] to resist fracture under the im--' of the latter positionof strains imposed through biting hard ob er.-ts. ltwillbe apparent that a re- -1nforcement of the character mentioned posand that the adjacent side arms of the rein forcements of the said porcelain teeth are "the toothbecause the material employed is actually increases I united at 4 by gold or equivalent metal 7 "fitted between and soldered to said arms, the connection 4 being disposed at thelower extremities of said arms so as to leave. the p e above de f r he new of wa h a crown. 5. secured upon natural teeth in various other ways.

' 5 into the-porcelain tooth itself,

vvater, toothpaste and the like, 11.0,, for sanitary reasons. .By referenceto the samefigure, it willbe seen that one of the porcelain, teethissoldered; as at to a gold the other extremity of the bridge, th dj "cent natunalfto-oth may he id d ith What. is known as a three-fourths crown on shown), and to adja-'- or rather the adjacent cent artificial tooth,

arm' of the reinforcement thereof, is soldered as? explained. It Will be apparent that a bridge of this character possesses great strength and that Where more than two porcelain teeth constitute a part of the 1 bridge; they form abutment supports for each other, Which'is impossible With'the pinanchoredtype of porcelain teeth. V Afporcelain tooth of porcelain teeth equipped With a reinforcement of the character described, may be anchored to adjacent For example, ofone of the in Fig. 10, the reinforcement porcelain teeth vious that a tooth provided With such remforcement may be anchored in the manner I explained through other means of support to those skilled in the art of dentis ry.

The method of producing the reinforcement and the groove inthe porcelain tooth for the reception otthereinforcement,does not aliect the character of the product and V 7 therefore need not he explained herein. It 1s desirable to state that Where an individual porcelain tooth is to he placed in position against a solid root of a natural tooth, the

IO reinforcement of theporcelain tooth may he provided With a pin Tito he cemented insuch r oot,the' pin to be cast or otherwiserigidly secured tothe. central portion oft-hereiniorcementinstead oi being halted directly and it will he vobvious that a'tooth thus reinforced and se cured to a root by a pin arranged as explained, will possess greater strength than where'the reinforcement oi this application,

.6 is lacking'and the pin is'einbedded in and backed on the tooth itself.

-An artificial tooth olf the type" described tooth 1 At I tooth embodying is soldered to a solid inlay 6 I 5:"of a natural 'tooth,instead of to a crown thereon as shown in Fig. 9. lit will be oh- 1. The combinationin serles or adjacent artificial teeth. provided not necessaryto identify herein hut familiar tooth and having an 'tooth having a groove across signature;

can he used to great advantage in plate Won;

as the emhedment or". an integral part of the plate in the groove 2 of the tooth increases the strength of the latter and unites it more firmly to the plate. shown in fragmentary form, is cast or molded onto the teeth 1, and into the groove 2 of the latter as at 9. if desired the connection can we made more secure by providing the tooth with alined holes 10 communieating with thesaid groove so that the rubher or equivalent plate material shall, in the inolding orcasting operation, run into the said holes and iorm'pmsll, for firmly anchoring the tooth to theplate.

From the above description it will be apparentthat l have produced an all-porcelain the featuresof the invention, and Wlii'ch'is susceptible of modification "in minor a'articulars Without de aartin from the principle of construction involved or sacrificing any of the advantagesof the appended claims.

I claim 1' bridgework of a with metal reinforcements embedded rigidly 1n and extending across thehases of the teeth and along the sides thereof, and means uniting thejuxtaposed portions of the rein- In Fig. 8, the plate 8,

grooves in its sides communicating with the groove in the base. and with alined holes intersectin the groove in the base, or a plate cast into said grooves and said holes.

I In testimony whereof I hereunto afiiX my HOWARD s. ,LovvnY.- 

